1994112 - Operating system call getaddrinfo failed (error no. 0 )

You find the following entries in the SystemLog repeatedly:
 
  Operating system call getaddrinfo failed (error no. 0 )
  NiConnect Unsuccessful, Return Code: -0003
  > Host:  <hostname>
  > Service: sapgwck 

Trace file from the GW (dev_rd) shows:

*** LOG Q0I=> NiPGetServByName: 'sapgwck' not found: getaddrinfo 
*** ERROR => GwIAsyncConn: GwBufConnect to <hostname> / sapgwck failed (rc=NIESERV_UNKNOWN)
*** LOG S0T=> GwIAsyncConn, GwBufConnect (-0003) [gwxx.c       1283]
*** LOG S0R=> GwIAsyncConn, GwBufConnect () [gwxx.c       1285]
*** LOG S0S=> GwIAsyncConn, GwBufConnect (sapgwck) [gwxx.c       1287]
*********************************************************************
*
*  LOCATION    SAP-Gateway on host <hostname>/ sapgw<nr>
*  ERROR       service 'sapgwck' unknown  
*
*  TIME        Wed Jun 19 07:19:06 2013
*  RELEASE     721
*  COMPONENT   NI (network interface)
*  VERSION     40
*  RC          -3
*  MODULE      nixxsl.cpp
*  LINE        184
*  DETAIL      NiSrvLGetServNo: service name cached as unknown
*  COUNTER     373210
*
*********************************************************************

A  RFC> Called function module: RFC_SYSTEM_INFO
A  *** ERROR => RFC ======> CPIC-CALL: 'ThSAPOCMINIT' : cmRc=26 thRc=665
Service name is not known
 [abrfcio.c    8175]
A  *** ERROR => RFC Error RFCIO_ERROR_SYSERROR in abrfcpic.c : 2327
CPIC-CALL: 'ThSAPOCMINIT' : cmRc=26 thRc=665

GW_SERVICE_UNKNOWN  665 Gateway service unknown tick-port services SM21, RC          -3, NiSrvLGetServNo: service name cached as unknown , KBA , BC-CST-GW , Gateway/CPIC , BC-CST-NI , Network Interface , Problem